package lab01;

public class Test06 {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        String score=in.next();
        switch(score)
        {
            case'A':
                System.out.println(">=85");break;
            case'B':
                System.out.println(">=70");break;
            case'C':
                System.out.println(">=60");break;
            case'D':
                System.out.println("<60");break;
        }
    }
}
